# import tensorflow as tf


# class Logger(object):
#     def __init__(self, log_dir):
#         """Create a summary writer logging to log_dir."""
#         self.writer = tf.summary.FileWriter(log_dir)

#     def scalar_summary(self, tag, value, step):
#         """Log a scalar variable."""
#         summary = tf.Summary(value=[tf.Summary.Value(tag=tag, simple_value=value)])
#         self.writer.add_summary(summary, step)

#     def list_of_scalars_summary(self, tag_value_pairs, step):
#         """Log scalar variables."""
#         summary = tf.Summary(value=[tf.Summary.Value(tag=tag, simple_value=value) for tag, value in tag_value_pairs])
#         self.writer.add_summary(summary, step)
